Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A transmission method comprising: generating a first symbol group that includes a control symbol for causing a communication partner apparatus to recognize that a short-range communication is to be performed, and a second symbol group that includes a data symbol for the short-range communication; transmitting the first symbol group at a first transmit power, wherein the first symbol group includes the control symbol and a first gain control (AGC) symbol; and transmitting the second symbol group at a second transmit power that is smaller than the first transmit power, wherein the second symbol group includes the data symbol and a second AGC symbol.
This invention relates to a transmission method for short-range communication systems, addressing the challenge of efficiently establishing and maintaining communication while optimizing power consumption. The method involves generating two distinct symbol groups: a first symbol group containing a control symbol to initiate short-range communication and a first automatic gain control (AGC) symbol, and a second symbol group containing a data symbol for the actual communication and a second AGC symbol. The first symbol group is transmitted at a higher power level to ensure reliable detection by the communication partner, while the second symbol group is transmitted at a lower power level to conserve energy during data transmission. The control symbol in the first group signals the partner apparatus to prepare for short-range communication, while the AGC symbols in both groups enable proper signal amplification at the receiver. This approach balances signal reliability and power efficiency, particularly useful in battery-powered devices where minimizing energy usage is critical. The method ensures robust communication setup while reducing overall power consumption during data transfer.
2. The transmission method according to claim 1 , wherein the first symbol group includes another control symbol indicating which of a first communication method for short-range communication and a second communication method for long-range communication is to be performed.
This invention relates to wireless communication systems, specifically methods for transmitting data between devices using different communication ranges. The problem addressed is the need for efficient and flexible communication protocols that can adapt to varying distances between transmitting and receiving devices. The invention provides a transmission method where data is divided into multiple symbol groups, with at least one group containing control symbols that determine the communication method to be used. The first symbol group includes a control symbol that specifies whether a first communication method for short-range communication or a second method for long-range communication should be performed. This allows the system to dynamically select the appropriate communication range based on the distance between devices, optimizing power consumption and data transmission efficiency. The method ensures compatibility with both short-range and long-range communication standards, enabling seamless transitions between different communication modes. The control symbol within the first symbol group acts as a selector, directing the system to use the most suitable communication method for the current operating conditions. This adaptability improves overall system performance by reducing unnecessary power usage and enhancing reliability in varying environments.
3. The transmission method according to claim 1 , wherein a relationship given by expression (1) is satisfied between a first average electric power of signal points in an in-phase/quadrature-phase plane for each symbol of the first symbol group and a second average electric power of signal points in the in-phase/quadrature-phase plane for each symbol in the second symbol group, 1 M ∑ j = 1 M ( I a , j 2 + Q a , j 2 ) > 1 N ∑ j = 1 N ( I b , j 2 + Q b , j 2 ) ( 1 ) where M denotes a number of signal points in the in-phase/quadrature-phase plane for the first symbol group, N denotes a number of signal points in the in-phase/quadrature-phase plane for the second symbol group, Ia,j denotes an in-phase component of each signal point in the first symbol group, Qa,j denotes a quadrature component of each signal point in the first symbol group, Ib,j denotes an in-phase component of each signal point in the second symbol group, and Qb,j denotes a quadrature component of each signal point in the second symbol group.
This invention relates to digital communication systems, specifically methods for transmitting data symbols with optimized power distribution to improve signal integrity and efficiency. The method involves grouping transmitted symbols into at least two distinct symbol groups, where the average electric power of signal points in the in-phase/quadrature-phase (I/Q) plane differs between the groups. The first symbol group has a higher average power than the second group, as defined by a mathematical relationship where the sum of squared I and Q components for all signal points in the first group exceeds the corresponding sum for the second group. The number of signal points in each group is denoted by M and N, respectively. This power imbalance between symbol groups can be used to enhance transmission performance, such as improving error rate or spectral efficiency, by strategically allocating higher power to more critical symbols or those more susceptible to noise and interference. The technique is applicable to various modulation schemes where symbols are represented as points in the I/Q plane, such as quadrature amplitude modulation (QAM) or phase-shift keying (PSK). The method ensures that the power distribution is mathematically constrained to maintain a predefined relationship between the groups, optimizing overall system performance.
4. The transmission method according to claim 1 , wherein a plurality of time segments in which a certain number of the first symbol groups are transmittable are provided between adjacent time segments in which the second symbol group is transmitted; and communication apparatuses that support a first communication method for short-range communication respectively transmit the first symbol groups in mutually different time segments within the plurality of time segments.
This invention relates to a transmission method for short-range communication systems, addressing the challenge of efficiently sharing communication resources among multiple devices. The method involves transmitting data in symbol groups, where a first type of symbol group (first symbol group) is used for short-range communication, and a second type (second symbol group) serves a different purpose, such as synchronization or control. The key innovation is the structured allocation of time segments for these symbol groups. Multiple time segments for transmitting the first symbol groups are interspersed between time segments reserved for the second symbol group. Each communication device supporting the short-range communication method transmits its first symbol groups in distinct, non-overlapping time segments within this allocated set. This ensures that multiple devices can coexist without interference, improving spectral efficiency and reliability in short-range communication environments. The method is particularly useful in scenarios where multiple devices must share a limited communication channel while maintaining low latency and high data integrity. The approach minimizes collisions by assigning unique time slots to each device, enabling seamless coexistence in dense deployment scenarios.
5. The transmission method according to claim 1 , wherein a single time segment in which the first symbol group is transmittable is provided between adjacent time segments in which the second symbol group is transmitted, and in the single time segment, the first symbol group is transmitted from one of a plurality of communication apparatuses that support a first communication method for short-range communication.
6. The transmission method according to claim 1 , wherein the communication using a first communication method for short-range communication is performed between a terminal and a base station, and when the terminal transmits the second symbol group, the first symbol group is transmitted from the base station that is a communication partner of the terminal.
7. A communication apparatus comprising: symbol generation circuitry that generates a first symbol group including a control symbol for causing a communication partner apparatus to recognize that a short-range communication is to be performed and a second symbol group including a data symbol for the short-range communication; and transmission circuitry that transmits the first symbol group at a first transmit power, wherein the first symbol group includes the control symbol and a first gain control (AGC) symbol, and that transmits the second symbol group at a second transmit power that is smaller than the first transmit power, wherein the second symbol group includes the data symbol and a second AGC symbol.
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January 12, 2021
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